/*
Decimal Binary Gray-Code
00 0000 0000
01 0001 0001
02 0010 0011
03 0011 0010
04 0100 0110
05 0101 0111
06 0110 0101
07 0111 0100
08 1000 1100
09 1001 1101
10 1010 1111
11 1011 1110
12 1100 1010
13 1101 1011
14 1110 1001
15 1111 1000
*/
module Gray2Bin(iGray, oBin);
input [3:0] iGray;
output [3:0] oBin;
///////////////////////////////////////
reg [3:0] oBin;
always @(iGray)
begin
case(iGray)
4'b0000: oBin = 4'b0000;
4'b0001: oBin = 4'b0001;
4'b0011: oBin = 4'b0010;
4'b0010: oBin = 4'b0011;
4'b0110: oBin = 4'b0100;
4'b0111: oBin = 4'b0101;
4'b0101: oBin = 4'b0110;
4'b0100: oBin = 4'b0111;
4'b1100: oBin = 4'b1000;
4'b1101: oBin = 4'b1001;
4'b1111: oBin = 4'b1010;
4'b1110: oBin = 4'b1011;
4'b1010: oBin = 4'b1100;
4'b1011: oBin = 4'b1101;
4'b1001: oBin = 4'b1110;
4'b1000: oBin = 4'b1111;
endcase
end
endmodule
module Bin2Gray(iBin, oGray);
input [3:0] iBin;
output [3:0] oGray;
////////////////////////////////////////
reg [3:0] oGray;
always @(iBin)
begin
case(iBin)
4'b0000: oGray = 4'b0000;
4'b0001: oGray = 4'b0001;
4'b0010: oGray = 4'b0011;
4'b0011: oGray = 4'b0010;
4'b0100: oGray = 4'b0110;
4'b0101: oGray = 4'b0111;
4'b0110: oGray = 4'b0101;
4'b0111: oGray = 4'b0100;
4'b1000: oGray = 4'b1100;
4'b1001: oGray = 4'b1101;
4'b1010: oGray = 4'b1111;
4'b1011: oGray = 4'b1110;
4'b1100: oGray = 4'b1010;
4'b1101: oGray = 4'b1011;
4'b1110: oGray = 4'b1001;
4'b1111: oGray = 4'b1000;
endcase
end
endmodule |
